Apron board for paper-making machines



July 1927' c. w. VALENTINE APRON BOARD FOR PAPER MAKING MACHINES Filed Jan. 22,

- amoentoz 1;; Elite (Mew Patented July 12,1927.

UNITED, STATES 1,635,772 PATENT OFFICE,

CHARLES W. VALENTINE, OF WATER'IOWN, NEW YORK, ASSIGNOR TO THE BAG LEY AND SEWALL COMPANY, OF WATERTOWN, NEW YORK, A CORPORATION OF NEW YORK.

APRON BOARD FOR PAPER-MAKING MACHINES.

Application filed January 22, 1926. semi No. 82,900.

This invention relates to certain improvements in Fourdrinier paper making machines and has particular reference to an improved apron board for the web forming en d of these machines.

In these.Fourdrinier machines, as ordinarily constructed,,the stock or pul from which the web is formed is delivere to the making wire through an opening between what is known as a slice and a cooperating member generally termed an apron or apron board. In these machines employing an apron board it is desirable that the board should .be parallel across the machine with the wire and breast roll over which the wire passes, and it is also desirable that the gap between the board and the wire be as small as possible without danger of the board rubbing the wire. It is further desirable that the board may be adjusted so that these conditions may be obtained with ease and sureness by the operator.

It is a special object of the invention to provide an improved .apron board of such flexibility or looseness that it may be ractically' self aligning with the breast mill or wire.

A further object of the invention is to produce an improved apron board which, after the alignment of the breast roll or wire, may be adjusted so that a uniform gap between the board and the rollior wire may be obtained widthwise of the machine.

With these and other objects not specifically referred to in View, the invention consists in certain novel parts, arrangements and combinations which will be described in connection-with the accompanying drawings and the novel features pointed out in the claims hereunto annexed.

In these .drawings,

Figure 1 is a sectional side view of so much of the making end of a Fourdrinier machine as is necessary for an understanding of the invention, and

Figure 2 is a sectional front view, partly broken away, the section being taken on line 22 of Fig. 1.

Referring now to these drawings, the breast roll is marked 1 and the making wire 2. -Pulp or stock is delivered to the wire from a head box indicated at 3 under a slice indicated at 4.

Cooperating with this slice is an apron board of improved construction, this apron therein.

board being so constructed and arranged that edge of the lip of the board and the roll may be obtained.

The specific means employed for this purpose may be varied. The construction shown, however, is a preferred one and will be described as illustrative of the invention. As shown, the apron board comprises a rigid portion 5 which includes a frame 6, this framing in turn being supported by suitable standards 7. The front of the rigid art 5 has a flexible or loose extension in the form of separate plates 8, these plates being secured to the rigid part of the board by means of a thin flexible sheet of metal 9. The front edge of this sheet extends somewhat beyond the plates 8, as indicated at 10, and lies closely adjacent the wire, the part being positioned so that the gap between the edge or lip 10 and the wire is as small as possible.

The plates 8 are supported by arms 11 preferably integral therewith and -these arms are supported so that they can have a rocking movement. As shown, the arms are supported on an extension 12 from the frame 6,

before referred to, and the ends of the .arms

are rounded, as indicated at 13, so that they are free to rock on the extension 12. The arms are locked against movement by suitable locking devices shown in. the form of screws 14 having operating handles 15. These screws pass through openings 16 in the extension 12, these openings beingof sufficient size to permit the screws to operate These screws are secured, as by pins 17, in the ends of the arms and the parts are held in locked position by means .of lock nuts 18 threaded on the screws and bearing against the under side of the extension 12.

The thin metal sheet 9 is of sufficient flexibility so that when the lock nuts 18 are loosened the plates 8 and the sheet 9 will drop of themselves against the wire and breast roll, so that the lip or edge 10 of the plate will align itself with the roll widthwise of the machine, the arms 11 rocking on the extension 12. By a light touch on the handles 15 the operator may determine by the feel whether the lip 10 is in contact with the roll, thus assuring himselfthat the parts are in aligned or arallel relation.

After this is done, t e parts may be adjusted to provide a uniform gap between the lip 10 and the breast roll, this gap being met wide enough to prevent rubbing of the lip on the wire. While various expedients may be adopted for this, a convenient one s that shown in which there are provided m1- crometer screws 20 having operating handles 21, these screws bein threaded through the frame 6, before re erred to, and bearing at their inner ends a ainst the lower parts of the arms. By a just-in these screws widthwise of the machine to t 1e same extent, the arms 11 will be quickly rocked and a uniform gap provided across the machine. After this is done, the arts may be secured in locked osition by t e lock nuts 18.

It will thus be seen from the construction described that the li or edge of the apron board may be readi y adjusted so that the lip of the board is parallel to the wlre and the desired ga between the edge and the wire is obtained.

While the invention has been shown and described in its preferred form, it will he understood that certain changes and variations ma be made in the specific structure without epartin from the invention, such structure being s own as illustrative of the invention.

What I claim is:

1. The combination in a Fourdrinier paper making machine, of the breast roll and the making wire, an apron board having a ri 'd ortion and a loose portion, and means 11 ocking the loose portion in adjusted position over the breast roll, the loose portion being of sufficient looseness that when the locking devices are released it will tend to align itself with the breast roll widthwise thereof.

2. The combination in a Fourdrinier paper making machine, of the breast roll and the making wire, an apron board havin a rigid portion and a loose portion, means or looking the loose portion in adjusted position over the breast roll, the loose portion being of sufficient looseness that when the locking devices are released it will tend to align eaarra itself with the breast roll widthwise thereof, and means for producing agap between the edge of the loose ortion and the roll of uniform height wi thwise of the roll.

3. The combination in a Fourdrinier paper making machine, of the breast roll and the making wire, an apron board havin a ri id portion, a portion loosely united t erewith including a plurality of separate lates extendin widthwise of the roll, roc ing supports or the latter portion, and means for ocking the loose portion in adjusted position over the breast roll.

4. The combination in a Fourdrinier paper making machine, of the breast roll and the making wire, an apron board having a rigid portion, a portion loosely united therewith, rocking supports for the latter, adjusting devices for rocking the supports, and means for locking the loose portion in adjusted position over the breast roll.

5. The combination in a Fourdrinier paper making machine, of the breast roll and the making wire, an apron board having a rigid portion, a loose metal sheet secured to the rigid portion, a plurality of plates extending lengthwise of the roll to which the sheet is secured, rocker supports for the plates, adjusting means for rocking the supports and means for locking the supports in adjusted position.

6. An apron board for Fourdrinier paper making machines comprising a rigid part, a thin metal sheet secured thereto, a plurality of plates extending widthwise of the roll to which the sheet is secured, and ad justable supports for the plates.

7 The combination in a Fourdrinier paper making machine, of the breast roll and making Wire, an apron board having a rigid portion, a portion loosely united therewith, rocking supports for the latter, adjusting screws hearing against the supports for rocking them, screws fixed to the supports, and locking nuts cooperating with the latter screws.

In testimony whereof, I have hereunto set my hand.

CHARLES W. VALENTINE. 

